1. Biphasic pattern
2. Increase in the level of progesterone and norepinephrine
3. Temperature falls by $0.5^{\circ}C$ after ovulation
4. It can predict ovulation precisely
Select the correct answer using the code given below:
Basal Body Temperature Characteristics
Basal Body Temperature (BBT) charting is a method used to track ovulation. Analyzing the given statements helps determine which are true:
Statement Analysis:
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Statement 1: Biphasic pattern
This statement is true. BBT typically exhibits a biphasic pattern: a lower temperature range before ovulation and a sustained higher temperature range after ovulation, reflecting hormonal changes.
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Statement 2: Increase in the level of progesterone and norepinephrine
This statement is considered true. The rise in BBT after ovulation is primarily driven by the increase in progesterone produced by the corpus luteum. Norepinephrine is also involved in thermoregulation and its levels can influence body temperature.
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Statement 3: Temperature falls by $0.5^{\circ}C$ after ovulation
This statement is false. BBT does not fall after ovulation; instead, it typically rises by about $0.2^{\circ}C$ to $0.5^{\circ}C$ due to the thermogenic effect of progesterone.
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Statement 4: It can predict ovulation precisely
This statement is false. BBT charting confirms that ovulation has occurred retrospectively (by observing the temperature rise) but is not precise enough to predict the exact moment of ovulation in real-time.
Conclusion on BBT Statements
Based on the analysis:
- Statement 1 is true.
- Statement 2 is true.
- Statement 3 is false.
- Statement 4 is false.
Therefore, the correct option includes statements 1 and 2.
Important Questions from Physiology of Menstruation & Fertilization
- Implantation of a fertilised ovum occurs on which day following fertilisation?
- Withdrawal bleeding following administration of progesterone in a case of secondary amenorrhea indicates all EXCEPT:
- Diagnostic criteria for PCOD are:
1. Oligo/amenorrohoea
2. Hyperandrogenism
3. Polycystic ovaries on ultrasound
Which of the above are correct? An 18 year old unmarried girl comes with complaints of heavy, prolonged bleeding during menses. Which among the following investigations is NOT usually advised?
- Consider the following statements regarding infertility:
1. Endometrial biopsy provides information regarding ovulatory factor
2. Both tubal and peritoneal factors can be assessed at laparoscopy
3. Unexplained infertility may be due to luteal phase defect
Which of the statements given above is/are correct?
